I got my database open. I just took that datafile offline using the command
told and then taken a backup of the controlfile and issued the command
recover database using backup controlfile until cancel and on prompting for
archive log , I passed the online redo log file name with absolute path and
bingo.. it worked.

Anyways thanx a million to Tom, Michael & Gogala for all ur response and
guidance.

almost correct
startup mount;
alter database datafile 'D:\DB\ORADATA\BODEV\NMSANDBOX_DATA.ORA' offline
drop;
alter database open;
if the database still wants to recover more files you need to drop them
also, if it wants to recover system it's time to learn irish
say
WHALE
OIL
BEEF
HOOKED
faster and faster with an bit of an irish lilt.
back to the problem at hand.
drop tablespace tablespace_of_the_above_datafile;
then reload your data because you were in noarchivelog mode so you must be
able to reload your data.

then take this opportunity to crank up your buffer cache to as big as
possible -- this is a joke, no flames please.

It is asking for an archive file because the dummy file that you created is
not an Oracle database file. So it is trying to bring it up to date. Even
though you are not running in archivelog mode, Oracle still acts the same
way - that is, it is keeping track of what would be the correct archivelog
file even though it did not write them out to disk.

It is asking for an archive file because the dummy file that you created is
not an Oracle database file. So it is trying to bring it up to date. Even
though you are not running in archivelog mode, Oracle still acts the same
way - that is, it is keeping track of what would be the correct archivelog
file even though it did not write them out to disk.